Plastic cement case

ABSTRACT

An improved cement case for effecting the floor mounting of a door control unit, such as a door closer or door check, for controlling a swinging door. The case is made of impact resistant plastic material and supports metal anchors which, with the case, are embedded in cement. The door control unit which is disposed in the case is directly connectable with the metal anchors.

United States Patent [72] Inventor Joseph J. Gaysowski Westchester, Ill.

[21] Appl. No. 618,447

[22] Filed Feb. 24, 1967 [45] Patented Mar. 23,1971

[73] Assignee Rixson Inc.

Franklin Park, Ill.

[54] PLASTIC CEMENT CASE 13 Claims, 11 Drawing Figs.

[52] U.S. Cl. 52/27, 52/127, 52/707 [51] Int. Cl E05f 7/00, E04b 1/41[50] Field of Search 220/38, 3.4, 55 (A); l6/49, 55; 52/27, 221, 704,707,127

[56] References Cited UNITED STATES PATENTS 1,023,294 4/1912 Bennett52/27 1,599,745 9/1926 Cinnamond 52/704X 2,687,788 8/1954 Rapp 52/704X2,867,349 1/1959 Parker, Jr. 220/33 2,933,755 4/1960 Carlson 16/55FOREIGN PATENTS 559,458 l/l958 Belgium 52/221 919,494 2/1963 GreatBritain 52/127 Primary Examiner-Alfred C. Perham AttorneyJohnson,Dienner, Emrich, Verbeck & Wagner ABSTRACT: An improved cement case foreffecting the floor mounting of a door control unit, such as a doorcloser or door check, for controlling a swinging door. The case is madeof impact resistant plastic material and supports metal anchors which,with the case, are embedded in cement. The door control unit which isdisposed in the case is directly connectable with the metal anchors.

PLASTIC CEMENT CASE BACKGROUND AND BRIEF SUMMARY OF THE INVENTIONHeretofore door control units have generally been mounted in-a cast ironcement case which is recessed into the floor at the pivot axis of thedoor, such cast iron case being usually embedded in a surroundingfilling of cement, withthe door control unit connected to the metal caseand transmitting forces to the cement through the metal case.

There are several objections to such cast iron cement cases and it isthe fundamental purpose of the present invention to avoidtheseobjections by providing a new and improved construction of case which iscomposed of a plasticmaterial, associated with a unique form andarrangement of metal anchors. One of the objections to a cast iron caseis that it is quite susceptible to fracture if it is allowed to dropupon a hard surface, which is always a possibility in the transportationof these cases and in their handling at the job site. In makingcomparative tests between cast iron constructions and plasticconstructions I discovered that, when assemblies composed of a cast ironcase and a cast iron cover were subjectedto drop tests of one foot, twofeet and three. feet down upon a cement floor the cast iron casefrequently cracked or sustained other damage such that the case wasrendered no longer usable. On the other hand, when the plastic case ofthe present invention underwent similar drop tests, only av slightdeformation results, at most, so that the case was still capable of use.

Another disadvantage of a cast iron case is that it is much heavier thana plastic case. For example, in one representative size of case, thecast iron construction weighed approximately 7 pounds, whereas theplastic construction of thesame size and formation weighed approximately1 pound. This substantial weight differential makes the plasticconstruction cheaper to ship and easier to handle.

With regard to corrosion, the plastic case has much better corrosionresistance compared to the cast iron case, under similar environmentalconditions.

The plastic construction is much more economical to make, affordingapproximately a 45 percent cost reduction per unit.

However, thedirect substitution of a plastic material for cast iron inthe cement case is not feasible because high loads andstresses resultingfrom use of the door control unit would have to be transmitted throughthe plastic. to the cement. A plastic case does not have the capabilityof transmitting or supporting as high a load as an iron case does.However, it is entirely adequate to act as a form for cement when cementis poured around the case on installation, since a cement case formed ofplastic material such as A.B.S. can effectively keep wet cement, waterand dirt out of the case.

Therefore, according to my invention the plastic case serves primarilyas a housing for the door control unit to keep out liquids, cement anddirt, while also serving to carry metal anchors which become embedded incement when the case itself is embedded in cement. The torsional andshock loads are transmitted'from the door control unit directly throughthe metal anchors to the cement, and thus the loads bypass the plasticcase completely.

The anchors are associated with the plastic case by integral plasticprotrusions or projections in the form of posts, lugs or nibs on thecase and by recesses and openings in the case which prevent the metalanchors from becoming disassociated from the plastic case duringhandling of the case before the case and anchors are installed in thecement. Alternately, or in a supplementary manner, the anchors may beassociated with the case by a temporary locating plate which also servesto close off the open top of the case and prevents cement, etc., fromentering the case during installation in the floor.

BRIEF DESCRIPTION OF THE VIEWS OF THE DRAWINGS Referring now to theaccompanying drawings illustrating a preferred embodiment of theinvention:

FIG. 1 is a plan view of my improved plastic cement case;

FIG. 2 is a side elevational view of the case of FIG. 1;

FIG. 3 is a fragmentary, vertical, sectional enlarged view takenapproximately on the plane of the line 3-3'of FIG. 1 illustrating one ofthe anchor sockets of the cement case prior to the insertion of theanchor therein;

FIG. 4 is a view similar to FIG. 3 showing a vertical section throughone of the metal anchors and an associated fragmentary portion of thecement case embedded in cement;

FIG. 5 is a detail, sectional, enlarged view taken on the plane of theline 5-5 of FIG. 1;

FIG. 6 is a detail plan view looking down upon the top end of one of themetallic anchors;

FIG. 7 is a side elevational view of the anchor of FIG. 6;

FIG. 8 is a top plan view. of the cement case of F IG.1 with a doorcontrol unit disposed in the case;

FIG. 9 is a side elevation of the case of FIG. 8 and illustratesextensions for the anchors and shows the door control unit indicated indotted outline;

FIG. 10 is a fragmentary, sectional, enlarged view on the line 10-10 ofFIG. 8and includes a modification in the form of an added fastener; and

FIG. 11 is a fragmentary view similar to FIG. 10 but showing a temporarylocating plate disposedin the upper portion of the case in place of thedoor control unit.

DETAILED DESCRIPTION Referring first to FIGS. 1 and'2, my improvedplastic case 10 comprises a lower portion 15 of a somewhat oval outline.The case is defined by a bottom wall 16 having substantially verticalcurved end walls 17 and 18 formed'integral therewith. The right-handcurved end wall 17 of FIG. 1 is formed concentrically around the centerC, and the left-hand curved end wall 18 is formed concentrically aroundthe center C, the righthand end wall 17 preferably being of largerradius than the left-hand end wall 1-8. These curved end walls arejoined together by substantially vertical diagonally extending straightsidewalls 19 integral therewith. Such sidewalls 19 preferably haveformed on the outside thereof integral upwardly extending reinforcingribs 20. The curved end walls 17, 18 and the straight sidewalls 19 havea slight outward flare (see FIG. 3) for molding purposes and thesidewalls, end walls and bottom wall are integral.

Formed as an integral upward extension of the lower part 15 of theplastic case is an upper portion 25. This is preferably of rectangulartraylike outline, in plan view, having an open top area, as viewed inFIG. 1, but may be of any other shape desired. Such traylike outlinecomprises the two end flanges 26, 27 and the two side flanges 28, 29integrally joined together at the four comers and also integrally joinedwith adjacent walls of the lower portion 15 by certain horizontal wallmeans or webs now to be described.

At the two corners of the case, at the right side of FIG. 1, are formedhorizontal walls or web portions 30 and 30. These web portions areformed integral with the right-hand end wall or flange 26 and with theadjacent sidewall 28 or 29, and merge integrally into the curved endwall 17. These two web portions 30 and 30' have circular holes 31 and 31respectively, passing therethrough which constitute the upper ends ofplastic mounting sockets S for anchors A which will be presentlydescribed.

At the other end of the upper tray formation 25 there are also formedhorizontal wall or web portions 34,. 34'. These web portions are formedintegrally with the end wall 27 and with the sidewalls 28,29 and mergeintegrally with the lower diagonal sidewalls 19. These web portions 34,34' have circular holes 35, 35, respectively, passing therethrough whichconstitute the upper ends of mounting sockets S for the two left-handanchors A.

At the lefthand end of the plastic case a downwardly sloping wall, orcover, portion 38 inclines from the end wall 27 of the tray formation 25to the curved end wall 18 of the lower portion 15 of the case, thiscover 38 being formed integral with both portions of the case. A portionof a door control unit (see FIG. 8) is disposed in this covered end ofthe case. The particular formation of the case which has been shown willserve to mount different shapes or sizes of door control units, but itwill be understood that the plastic case could be formed in other sizesor shapes to receive other types and shapes of door control units.

The case 10 is fonned of moldable or castable lightweight nonmetallic,nonceramic material which is impact resistant. I prefer a thermoplasticmaterial of the A.B.S. type (acrylonitrile-butadiene-styrene) available,for example, under brand names such as Cycolac G.S.M. (Borg WarnerCorporation) or Kralastic (U.S. Rubber Company).

Referring now to the four sockets S of the case 10, a circular holes,such as holes 31, 31', 35 or 35', forms the uppermost element of each ofthese sockets. Below and adjacent the holes 31 and 31 is another elementof plastic sockets S at the right end of the case consisting of avertical rib 60 formed integral with the plastic case and projectingoutwardly to bear against the back or inner side of the anchors shank50. As shown in FIGS. 3 and 4, the lower end of this projecting rib 60is formed with an integral protrusion or nib 61, which forms a limitingstop holding the anchor against downward movement once it has beeninserted into the socket S. The plastic composition of the case affordssufficient flexibility to permit the anchor A to be pressed past thisnib 61 when the anchor is being pushed upwardly into the hole 31 or 31'where it has a light press fit.

The socket S consists of still another element in the form of acylindrical post 70 formed integral with the upper portion 25 of thecase. This plastic post extends downwardly from web 30, for example, andfits in the right angle space between the two metallic wings 51 and 52of each anchor (See FIG. 8). This post holds the anchor against rotarymovement, which is helpful particularly when one is threading the screw42 down into the threaded bore 44 within the shank portion 50 before theanchor is set in the cement. The post 70 is properly positioned forengaging between the wings 51 and 52 by locating the axis of the post onan extension of the radial line r extending from the center C throughthe center of the hole 31. The post 70 may terminate short of the bottomends of the wings 51 and 52, to expose more area of the wings forengagement with the surrounding cement.

The formation of the anchor-holding sockets S at the lefthand end of theunit, as viewed in FIGS. 1 and 2, is substantially the same as at theright-hand end, except that the outwardly projecting rib 80 is madesubstantially as wide as the shank of the anchor, and is formed with arelatively wide depression or groove 82 extending downwardly therealongin which the surface of the shank 50 will seat when the anchor isassociated with the case, A nib or protrusion 81 projects outwardly fromthe lower end of the rib 80, to perform the same stop function as doesthe nib 61 in FIGS. 3 and 4.

The two web portions 30, 30 at the right-hand end and the two webportions 34, 34' adjacent to the left-hand end of the case, as viewed inFIGS. 1 and 2, serve to support the four corners of top wall 40 of adoor control unit (See FIGS. 8, 9 and 11). Screws 42 pass down throughholes 43 in connecting portions, in the form of flanges, of this wall40, and screw into tapped holes 44 in each of the four anchor units Amounted in the sockets S of the plastic case 10.

Referring now in detail to these anchor units A, which are allidentical, each is preferably composed of metal and l find that powderediron sintered into the form of the anchor to be a very satisfactorymaterial both because of its adequate strength and savings in cost.Referring particularly to FIGS. 6 and 7, the anchor comprises acylindrical shank or body portion 50 from which laterally projects astructure in the form of two longitudinally extending projections, suchas wing portions 51 and 52, which are at right angles to each other(FIG. 6). These two integral wings extend from the bottom end of thecylindrical shank 50 up to a level below the upper end of the anchorwhereby a shoulder 54 is provided on each wing. The cylindrical upperend 55 of the anchor extending from the shoulder 54 to the top end, hasa light press fit in any one of the holes 31, 31', 35 and 35' formed inthe web portions 30, 30', 34 and 34'. The upper extremity of the shankis beveled or chamfered as indicated at 57, to facilitate the insertionof the shank in an upward direction into the bottom end of a hole, suchas holes 31, 31, 35 and 35. When the anchors are positioned in theirsockets the shoulders 54 at the upper ends of the wings 51 and 52 abutagainst the undersides of the armate web portions 30, 30', 34 and 34' ofthe case and prevent the anchors from being moved upwardly through theholes 31, 31', 35 and 35'. It will be obvious that the projecting wingportions 51 and 52 preclude the insertion of the anchor downwardly intothe top ends of the holes 31, 35. Preferably the upper ends of theshanks 50 of the anchors A extend slightly above the plane of the webs30, 30, 34 and 34' of the case 10.

The outer surface of each of the two wings 51 and 52 of each anchor isinclined upwardly and inwardly as at 58. This increases the cementanchorage when the overlying cement sets but also more easily permitsthe anchors to be forced out of the cement if it is ever necessary toremove them.

A finishing cover plate or threshold (FIG. 4) may be fastened to the top40 of the door control unit 39 by screws which thread into threadedapertures 45 in the top wall 40.

Referring now to the installation of the improved plastic case 10 andits anchors A, the anchors A are first inserted upwardly into the foursockets S from the under sides thereof, by having the upper ends of themetal shank portions 50 pressed into the holes 31, 31+, 35 and 35' inthe plastic web portions 30, 30, 34 and 34 and past the nibs 61 and 81until the lower ends of the anchors can snap past the nibs and rest onthem. During this procedure the anchors are directed so that their wings51 and 52 straddle the downwardly extending plastic posts 70.

The anchors are thereby associated with and supportable by the cementcase since they are restrained from separation from the case by axialmovement by reason of their shoulders 54 bearing on the under side ofthe webs 30, 30', 34 and 34' and because of the nibs 61 or 81. They arerestrained against lateral separation from the case by reason of theribs 61, or 81, integral with the walls of the case, the vertical posts70, and the walls of the holes 30, 30', 34 and 34 which bear against theouter upper surface 55 of the shank portion 50. Furthermore, the anchorsare restrained against rotation relative to the cement case because thewings 51 and 52 straddle a post 70.

The assembly of the plastic case 10 and its anchors A is then located ina recess in the floor at the proper place for aligning the door controlunit with the axis of the door. Wet cement is then poured around thecase 10 and around the wings 51, 52 of each of the anchors A. The doorcontrol unit 39 can then be secured to the anchors A, preferably afterthe cement is set, by passing the screws 42 through the holes 43 andthreading them down into the tapped holes 44 in the anchor shanks.Alternatively, after the anchors have been associated with the case 10,the door control unit 39 can be placed in the case 10 and can be securedto the anchors A so that the plastic case, door closer unit, and anchorsA can be positioned as a unit in the floor before pouring the concrete.

It will be seen from the foregoing that at each of the anchors A thedirect metal-to-metal contact between the flanges on the top wall 40 ofthe door control unit 39 and the tops of the anchor shanks 50 results ina complete bypassing of the door loads past the plastic materialdirectly to the cement. Also, the unique mounting of the anchors in theplastic sockets prevents the anchors from falling out of the plasticcase during the preliminary handling of the assembly in the act oflocating the assembly with respect to the floor and embedding it incement.

I68. 8 and 9 are views similar to those of FIGS. 1 and 2 but showing thedoor control unit 39 disposed in the case 10 and secured to the anchorsA. Adjacent each corner of the top 40 of unit 39 there is a slightlyraised, plane horizontal surface 43. At each such surface there is ahole 43 aligned with the in the event it is desired to increase theanchoring effect of 5 an anchor A, I provide an extension 87 which canbe a threaded bolt, threaded into the lower end of the threaded opening44 of the anchor. Obviously bolts of different length may be used ifdesired.

In FIG. there is shown a modification of the plastic post 10 70 whichfits between the wings 51 and 52 of the anchor A. It is made with ahollow center 88 and is adapted to receive a self-threading fastener inthe form of a screw 89 with an enlarged head which can engage the lowerend of the anchor A.

Such fastening means 89 may be used if exceptionally rough l5 handlingof the case and its associated anchors is expected prior to placement inthe floor, otherwise they are not needed.

FIG. 11 illustrates the manner in which a temporary plate 90, having aconfiguration similar to that of the open upper rectangular portion (25)of case 10, may be secured in the case to the anchors A to keep theinterior of the case from having dirt or cement get in it prior to useor during its embedment in cement. The plate has four holes such as hole91, disposed to exactly overlie the anchors A. The plate may be removedafter the case is in place and then the door control unit 39 may beplaced in the case and secured to the anchors. An additional advantagewhich arises from the use of the temporary locating plate 90 is that itassists in aligning the anchors within their sockets S so that theanchors will be held in the cement, when it is set, in proper alignmentfor reception of the same screws which will be used to secure the doorcontrol unit 39 to the anchors after the temporary plate 90 has beenremoved. v

If a temporary plate 90 is used, it would be possible to dispense withprotrusions such as 61 and 81 of the sockets S, 3

provided the plate 90 is left in the case and still secured to theanchors A until after the case has been disposed in the floor and thecement has been poured. Preferably the plate 90 is left in the caseuntil after the cement has set around and over the anchors. It ispossible to eliminate protrusions 61 and 81 in 40 such instance becausethe plate 90 and screws 42 will assure that the anchors are associatedwith the case 10. The screws 42 have their heads bearing on the top ofplate 90, and plate 90 rests on the horizontal webs 30, 30', 34 and 34,while the lower ends of screws 42 are threaded into the anchors A andhold the anchors with their abutment surfaces, or shoulders, 54 againstthe under side of the webs 30, 30', 34 and 34'. However, it is preferredto use the protrusions 61 and 81, since the case 10 is then adapted tobe used in a greater variety of ways.

While I have described a preferred form of my invention I do not intendto be limited to that specific form, except insofar as the claims are solimited, since modifications will readily suggest themselves to oneskilled in the art who has my disclosure before him.

Iclaim:

1. In combination, a door control unit adapted to have anchorage to abody of cement in a floor and said door control unit having a rigid,metal, stressdransmitting, connecting portion; fastening means andrigid, metal, stress-transmitting anchoring means for connecting saiddoor control unit by means of said unit's rigid metal,stress-transmitting, connecting portion to said body of cement in whichthe anchoring means is adapted to be rigidly embedded; and a plasticcement case for substantially separating said door control, unit fromsaid cement; said anchoring means being adapted to be carried by saidcement case prior to embedment in the cement and being carried by andsupported in the cement after said anchoring means and case are embeddedin cement and the cement has hardened, and said rigid, metal,stress-transmitting, connecting portion of the door control unit beingconnected to said rigid, metal, stress-transmitting anchoring means inmetal-to-metal contact without the plastic cement case intervening inthe connection, and thereby being connected to the hardened cement,.whereby substantially all stresses originating from operation of thedoor control unit will be transmitted directly to the cement instead ofbeing transmitted to the cement by means of the walls of the plasticcement case.

2. The invention of claim 1 wherein portions of the anchoring meansextend from outside the cement case through an opening in the cementcase and those extending portions are engaged by, and serveto support,said rigid, metal, stresstransmitting, connecting portion of the doorcontrol unit.

3. For use with a door control unit having a rigid, metal,stress-transmitting, connecting portion and being adapted to haveanchorageto a body of cement in a floor, a plastic cement case toseparate from the cement the door control unit which is adapted to beseated within the case, and rigid, metal, stress-transmitting anchormeans adapted to anchor the door control unit to the body of cement,said anchor means being adapted to be carried by said cement case priorto embedment in cement and being carried by and supported in the cementafter said anchor means and case are'embedded in cement and the cementis hardened, and said rigid, metal, stress-transmitting, connectingportion of the door control unit being adapted to be connected to saidrigid, metal, stress-transmitting anchor means in metal-tometal contact,without the plastic cement case intervening in the connection, andthereby being connected to the hardened cement, whereby substan-- tiallyall stresses originating from operation of the door control unit will betransmitted directly to the cement instead of being transmitted to thecement by means of the walls of the 5 plastic cement case.

4. The case of claim 3 wherein the anchor means may be disassociatedfrom said case and are constructed of a rigid metallic material.

5. The invention of claim 3 together with a locating plate and whereinthe anchor means are supportable from the case through the intermediaryof said locating plate which is disposed in the open upper side of thecase and temporarily connected with the anchor means.

6. The invention of claim 3 wherein the anchor means are carried by thecase and have an anchoring portion embeddable in the body of cement anda connecting portion exposed so as to be operatively and rigidlyconnectable with the rigid, metal, stress-transmitting, connectingportion of the door control unit, whereby support for the door controlunit is derived directly from the hardened cement through the anchormeans and not through the walls of the cement case.

7. The invention of claim 3 wherein the case has socket means, includingopenings through the case, for carrying the anchor means with the case.

8. The invention of claim 7 wherein a socket means includes protrusionsconnected with the case and adapted to hold an associated anchor meansagainst axial, lateral and rotational displacement relative to the casewith a portion of the anchor means extending through an opening in thecase.

9. The invention of claim 8 together with fastening means connectablewith one of the protrusions to restrain said anchor means from becomingdisassociated from said case.

10. The invention of claim 7 wherein an anchor means comprises a shankportion fittable within the socket means and having a portion extendingthrough an opening in the case and adapted for connection with theconnecting portion of the door control unit, and at least one portionprojecting from the shank portion for embedded anchorage in the cement.

11. The invention of claim 10 wherein said one portion of said anchormeans is a laterally extending wing member which has an upwardly andinwardly inclined surface.

12. The invention of claim 3 wherein said anchor means is internallythreaded and thereby adaptable for connection with a door control unit.

13. The invention of claim 12 together with extension means for saidanchor means.

1. In combination, a door control unit adapted to have anchorage to abody of cement in a floor and said door control unit having a rigid,metal, stress-transmitting, connecting portion; fastening means andrigid, metal, stress-transmitting anchoring means for connecting saiddoor control unit by means of said unit''s rigid metal,stress-transmitting, connecting portion to said body of cement in whichthe anchoring means is adapted to be rigidly embedded; and a plasticcement case for substantially separating said door control unit fromsaid cement; said anchoring means being adapted to be carried by saidcement case prior to embedment in the cement and being carried by andsupported in the cement after said anchoring means and case are embeddedin cement and the cement has hardened, and said rigid, metal,stress-transmitting, connecting portion of the door control unit beingconnected to said rigid, metal, stresstransmitting anchoring means inmetal-to-metal contact without the plastic cement case intervening inthe connection, and thereby being connected to the hardened cement,whereby substantially all stresses originating from operation of thedoor control unit will be transmitted directly to the cement instead ofbeing transmitted to the cement by means of the walls of the plasticcement case.
 2. The invention of claim 1 wherein portions of theanchoring means extend from outside the cement case through an openingin the cement case and those extending portions are engaged by, andserve to support, said rigid, metal, stress-transmitting, connectingportion of the door control unit.
 3. For use with a door control unithaving a rigid, metal, stress-transmitting, connecting portion and beingadapted to have anchorage to a body of cement in a floor, a plasticcement case to separate from the cement the door control unit which isadapted to be seated within the case, and rigid, metal,stress-transmitting anchor means adapted to anchor the door control unitto the body of cement, said anchor means being adapted to be carried bysaid cement case prior to embedment in cement and being carried by andsupported in the cement after said anchor means and case are embedded incement and the cement is hardened, and said rigid, metal,stress-transmitting, connecting portion of the door control unit beingadapted to be connected to said rigid, metal, stress-transmitting anchormeans in metal-to-metal contact, without the plastic cement caseintervening in the connection, and thereby being connected to thehardened cement, whereby substantially all stresses originating fromoperation of the door control unit will be transmitted directly to thecement instead of being transmitted to the cement by means of the wallsof the plastic cement case.
 4. The case of claim 3 whereIn the anchormeans may be disassociated from said case and are constructed of a rigidmetallic material.
 5. The invention of claim 3 together with a locatingplate and wherein the anchor means are supportable from the case throughthe intermediary of said locating plate which is disposed in the openupper side of the case and temporarily connected with the anchor means.6. The invention of claim 3 wherein the anchor means are carried by thecase and have an anchoring portion embeddable in the body of cement anda connecting portion exposed so as to be operatively and rigidlyconnectable with the rigid, metal, stress-transmitting, connectingportion of the door control unit, whereby support for the door controlunit is derived directly from the hardened cement through the anchormeans and not through the walls of the cement case.
 7. The invention ofclaim 3 wherein the case has socket means, including openings throughthe case, for carrying the anchor means with the case.
 8. The inventionof claim 7 wherein a socket means includes protrusions connected withthe case and adapted to hold an associated anchor means against axial,lateral and rotational displacement relative to the case with a portionof the anchor means extending through an opening in the case.
 9. Theinvention of claim 8 together with fastening means connectable with oneof the protrusions to restrain said anchor means from becomingdisassociated from said case.
 10. The invention of claim 7 wherein ananchor means comprises a shank portion fittable within the socket meansand having a portion extending through an opening in the case andadapted for connection with the connecting portion of the door controlunit, and at least one portion projecting from the shank portion forembedded anchorage in the cement.
 11. The invention of claim 10 whereinsaid one portion of said anchor means is a laterally extending wingmember which has an upwardly and inwardly inclined surface.
 12. Theinvention of claim 3 wherein said anchor means is internally threadedand thereby adaptable for connection with a door control unit.
 13. Theinvention of claim 12 together with extension means for said anchormeans.